a) 3x ( 4x - 2 ) - 4x ( 3x - 1 ) = 6
12 x2 - 6x - 12 x2+ 4x = 6
( 12 x2 - 12 x2 ) - ( 6x - 4x ) = 6
0 - 2x = 6
2x = 6
x = 3
a) 3x ( 4x - 2 ) - 4x ( 3x - 1 ) = 6
12 x2 - 6x - 12 x2+ 4x = 6
( 12 x2 - 12 x2 ) - ( 6x - 4x ) = 6
0 - 2x = 6
2x = 6
x = 3
a) 3x ( 4x - 2 ) - 4x ( 3x - 1 ) = 6
12 x2 - 6x - 12 x2+ 4x = 6
( 12 x2 - 12 x2 ) - ( 6x - 4x ) = 6
0 - 2x = 6
2x = 6
x = 3
a) 3x ( 4x - 2 ) - 4x ( 3x - 1 ) = 6
12 x2 - 6x - 12 x2+ 4x = 6
( 12 x2 - 12 x2 ) - ( 6x - 4x ) = 6
0 - 2x = 6
2x = 6
x = 3
tìm x biết
a) (6x-3) (2x+4) + (4x-1) (5-3x) = -21
b) 6x (3x+5) - 2x (9x-2) + (17-x) (x-1) + x (x-18) =0
c) (15-2x) (4x+1) - (13-4x) (2x-3) - (x-1) (x+2) + x2=52
d) (8x-3) (3x+2) - (4x+7) (x+4) = (2x+1) (5x-1) - 33
d,5x+10/4x-8.4-2x/x+2
Bài 2: rút gọn
a, 6x ² y ³/8x ³y ²
b, x ³-x/3x+3
c, x ²+3xy/x ²-9y ²
d, x ²+4x+4/3x+6
Bài 3: Thực hiện phép tính
a, (x/x-3+(9-6x/x ²-3x)
b, 1/x-1/x+1
c, (x-12/6x-36)+(6/x ²-6x)
d, (6x-3/x):(4x ²-1/3x ²)
e, (x+y/2x-2y)-(x-y/2x+2y)-(y ²+x ²/y ²-x ²)
f, 7x+6/2x(x+7)-3x+6/2x ²+14x
g, (2/x+2-4/x ²+4x+4):(2/x ²-4+1/2-x)
B1: quy đồng mẫu số các phân thức:
a. 5/ 6x^2y ; 7/ 12xy^2 ; 11/ 18xy
b. 4x+2/ 15x^3y ; 5y - 3/ 9x^2y ; x+1/5xy^3
c. 3/2x ; 3x-3/2x-1 ; 3x-2/2x- 4x^2
d. x^3 + 2x / x^3+1 ; 2x/ x^2 - x +1 ; 1/ x+1
e. y/ 2x^2 - xy ; 4x/ y^2 - 2xy
f. 1/x+2 ; 3/ x^2 - 4 ; x-14/ ( x^2 + 4x + 4 ) (x-2)
g. 1/x+2 ; 1/ (x+2)(4x+7) ;
h. 1/x+3 ; 1/ (x+3)(x+2) ; 1/ (x+2)(4x+7)
B2: dùng quy tắc đổi dấu để tìm mẫu thức chung :
a.4/ x+2 ; 2/x-2 ; 5x-6/4-x^2
b. 1-3x/2x ; 3x-2/2x-1 ; 3x-2/2x-4x^2
c. 1/ x^2 + 6x + 9 ; 1/ 6x-x^2-9 ; x/ x^2 -9
d. x^2 + 2/ x^3 - 1 ; 2/ x^2 + x +1 ; 1/ 1-x
e. x/ - 2y ; x/ x+2y ; 4xy/ 4y^2 - x^2
Ai làm xong trước mình tick nha!
làm phép chia :
a) (x^4 -2x^3 + 2x -1) : (x^2 - 1)
b) (x^3 -8) : (x^2 + 2x +4)
c) (x^6 - 2x^5 + 2x^4 + 6x^3 - 4x^2)n: 6x^2
d) (-2x^5 + 3x^2 - 4x^3) :2x^2
e) (15x^3 - 10x^2 + x - 2) : (x - 2)
f) (2x^4 - 3x^3 - 3x^2 + 6x - 2) : (x^2 - 2)
Tìm min
F=3x^2 +x -2
G= 4x^2+2x-1
H=5x^2-x+1
Tìm max
A= -x^2 -6x+3
B=-x^2+8x-1
C= -x^2-3X+4
D= -2x^2+3x-1
E= -3x^2 – x +2
F= -5x^2 -4x +3
G= -3x^2 – 5x+1
Bài 4: Tìm x, biết:
a) 3(2x – 3) + 2(2 – x) = –3 ; b) x(5 – 2x) + 2x(x – 1) = 13 ;
c) 5x(x – 1) – (x + 2)(5x – 7) = 6 ; d) 3x(2x + 3) – (2x + 5)(3x – 2) = 8 ;
e) 2(5x – 8) – 3(4x – 5) = 4(3x – 4) + 11; f) 2x(6x – 2x 2 ) + 3x 2 (x – 4) = 8.
1) Phân tích thành nhân tử:
a) x^4+2x^3-4x-4
b)x^2-2x-4y^2-4y
c)x^2(1-x^2)-4-4x^2
d)x^2+y^2-x^2y^2+xy-x-y
2) Phân tích thành nhân tử:
a)x^2+2x-24
b)x^2+3x+2
c)2x^2+3x+1
d)3x^2-4x+1
3) a) Tìm GTNN:
A=x^2+6x-5
B=x^2-3x+4
b) Tìm GTLN:
C= -x^2-2x+7
D= -3x^2-4x+2
Bài 1. Thực hiện các phép nhân a) 4x(3x – 1) – 2(3x + 1) – (x + 3)
b) 3x(4x – 3) – (2x – 1)(6x + 5)
c) 4x(3x2 – x) – (2x + 3)(6x2 – 3x + 1)
d) (x – 2)(x + 2)(x2 + 4)